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Relation of Giant Thermo-EMF, Magnetothermo-EMF, Magnetoresistance, and Magnetization to Magnetic Impurity States in Manganites Nd(1–x)Sr x MnO3 and Sm(1–x)Sr x MnO3

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Abstract

Thermo-EMF, magnetothermo-EMF, magnetoresistance, and magnetization of single-crystal samples of Nd(1–x)Sr x MnO3 and Sm(1–x)Sr x MnO3 with 0 ≤ x ≤ 0.3 have been studied experimentally. A sharp increase in the thermo-EMF and giant magnetothermo-EMF and magnetoresistance has been observed near the Curie point T C in compounds with 0.15 ≤ x ≤ 0.3. At the same time, no peculiarities have been found in compositions with x = 0. Since compounds with x > 0 consist of ferromagnetic clusters of the ferron type that reside in an antiferromagnetic A-type matrix, this means that the sharp increase in the thermo-EMF near T C is caused by ferrons. Indeed, the disappearance of ferrons due to a magnetic field or heating above T C leads to an abrupt decrease in the thermo-EMF. Therefore, thermo-EMF in alloyed magnetic semiconductors has been determined by the impurity concentration and the sample volume.

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Authors and Affiliations

  1. Moscow State University, Moscow, 119991, Russia

    L. I. Koroleva, I. K. Batashev & A. S. Morozov

  2. Moscow Power Institute, Moscow, 111250, Russia

    A. M. Balbashov

  3. Institute of Physics, Polish Academy of Sciences, Warsaw, 02-668, Poland

    H. Szymczak & A. Slawska-Waniew

Authors
  1. L. I. Koroleva
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  2. I. K. Batashev
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  3. A. S. Morozov
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  4. A. M. Balbashov
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  5. H. Szymczak
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  6. A. Slawska-Waniew
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Correspondence to L. I. Koroleva.

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Original Russian Text © L.I. Koroleva, I.K. Batashev, A.S. Morozov, A.M. Balbashov, H. Szymczak, A. Slawska-Waniew, 2018, published in Zhurnal Tekhnicheskoi Fiziki, 2018, Vol. 63, No. 2, pp. 228–233.

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Koroleva, L.I., Batashev, I.K., Morozov, A.S. et al. Relation of Giant Thermo-EMF, Magnetothermo-EMF, Magnetoresistance, and Magnetization to Magnetic Impurity States in Manganites Nd(1–x)Sr x MnO3 and Sm(1–x)Sr x MnO3. Tech. Phys. 63, 220–225 (2018). https://doi.org/10.1134/S1063784218020202

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